A chimney on a flat roof area.

Chimney cricket on a slate roof.

Useful Links:

1. Building Codes: 2015 International Building Code - "SECTION 2113 MASONRY CHIMNEYS" - available on the UpCodes website.

2. Building Codes: 2015 International Residential Code - "SECTION R1003 MASONRY CHIMNEYS" - available on the UpCodes website.

3. Building Codes: "R903.2.2 Crickets and Saddles" from the 2015 IRC and "1503.6 Crickets and Saddles" from the 2015 IBC are relevant. Both available on the UpCodes website.

4. Maintenance: "Water and Your Masonry Chimney" is a short general introduction to weather-related chimney maintenance available on the Chimney Safety Institute of America website.

5. Technical: "Chimney Flashings" is an excellent illustrated article in ASHI Reporter, a monthly publication of the American Society of Home Inspectors.

6. Technical: "Technical Notes 19B - Residential Chimneys - Design and Construction" is a great document for the technical information as well as the general understanding of chimneys that it provides. Available on the excellent website of the Brick Industry Association.